CN218785161U - Cold heading frock is used in production of eccentric pivot of on-vehicle refrigerator door - Google Patents

Abstract

A cold heading tool for producing an eccentric rotating shaft of a vehicle-mounted refrigerator door comprises a first die structure, a second die structure, a third die structure, a fourth die structure, a fifth die structure and a sixth die structure which are used for sequentially forming the eccentric rotating shaft; the bar workpiece is subjected to eccentric punch forming step by step through the first die structure, the second die structure, the third die structure and the fourth die structure, and is subjected to punching forming through the fifth die structure and the sixth die structure; the first die structure, the second die structure, the third die structure, the fourth die structure, the fifth die structure and the sixth die structure all comprise an upper die structure and a lower die structure which are arranged in the vertical direction. The multi-stage cold heading process is carried out on the bar workpiece through the plurality of dies, so that a high-quality product with high position precision is obtained, the production period is shortened, the production efficiency is improved, the production cost and the labor cost are greatly reduced, and the multi-stage cold heading process has wide applicability.

Description

Cold-heading frock is used in production of eccentric pivot of on-vehicle refrigerator door

Technical Field

The utility model relates to a connecting piece production field especially relates to a cold-heading frock is used in production of eccentric pivot of on-vehicle refrigerator door.

Background

The door and the door body of the household refrigerator or the vehicle-mounted refrigerator need a connecting piece during installation, and the connecting piece comprises a small shaft section connected with the door, a large shaft section connected with the door body and a connecting section for ensuring the relative position between the door and the door body, so that the opening and closing actions of the door are realized.

According to the traditional process, the connecting piece is respectively processed into a small shaft section, a large shaft section and a connecting section through a processing center, and finally the small shaft section, the large shaft section and the connecting section are connected through a welding mode. But because the small shaft section, the large shaft section and the connecting section are eccentrically arranged, the connecting section has a limit boss, the connecting hole at the end part of the large shaft section is a flat hole, the precision of the relative angle position between the small shaft section and the large shaft section is higher, the existing production method has the defects of longer production period and poorer efficiency, and the existence of welding errors causes the low dimensional precision of the connecting piece, thereby causing loss.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: the utility model aims at providing a cold-heading frock is used in production of on-vehicle refrigerator door eccentric rotating shaft has solved the original problem of depositing eccentric rotating shaft production existence.

The technical scheme is as follows: the utility model provides a cold-heading frock is used in production of eccentric pivot of on-vehicle refrigerator door, including first mould structure, second mould structure, third mould structure, fourth mould structure, fifth mould structure, the sixth mould structure that is used for eccentric pivot to take shape in proper order; the bar workpiece is subjected to eccentric punch forming step by step through the first die structure, the second die structure, the third die structure and the fourth die structure, and is subjected to punching forming through the fifth die structure and the sixth die structure;

the first die structure, the second die structure, the third die structure, the fourth die structure, the fifth die structure and the sixth die structure all comprise an upper die structure and a lower die structure which are arranged in the vertical direction.

The multi-stage cold heading process is carried out on the bar workpiece through the plurality of dies, so that a high-quality product with high position precision is obtained, the production period is shortened, the production efficiency is improved, the production cost and the labor cost are greatly reduced, and the multi-stage cold heading process has wide applicability.

Further, the upper die structure of the first die structure comprises a first upper die shell, a first upper die rear pad and a first upper die stamping rod, the first upper die rear pad is arranged at the upper position in the first upper die shell, the first upper die stamping rod is arranged at the lower position in the first upper die shell, and the end part of the first upper die stamping rod is connected with the first upper die rear pad; the lower die structure of the first die structure comprises a first lower die shell and a first lower die rod, and one end of the first lower die rod is arranged in the first lower die shell; the first upper die stamping rod and the first lower die stamping rod are arranged eccentrically; a first lower die mould core is embedded in the first lower die mould shell, a first forming hole which penetrates through the first lower die mould core is arranged in the first lower die mould core and comprises a first forming hole section A, a first forming hole section B and a first forming hole section C which are sequentially arranged, the first forming hole section A and the first forming hole section B are eccentrically arranged, a transition fillet is arranged at the joint of the first forming hole section A and the first forming hole section B, and the first forming hole section B and the first forming hole section C are concentrically arranged; the first lower die mould shell is internally provided with a first through guide hole which is eccentrically arranged, and the first guide hole is concentric with the section B of the first forming hole of the first lower die mould core. And (3) carrying out intense-beam eccentric stamping on the bar workpiece at the first forming hole of the first die structure, and carrying out primary forming on the small shaft section of the eccentric rotating shaft under the extrusion of the B section of the first forming hole.

Furthermore, the upper die structure of the second die structure comprises a second upper die shell, a second upper die rear pad and a second upper die stamping rod, the second upper die rear pad is arranged at the upper position in the second upper die shell, the second upper die stamping rod is arranged at the lower position in the second upper die shell, and the end part of the second upper die stamping rod is connected with the second upper die rear pad; the lower die structure of the second die structure comprises a second lower die shell, a second lower die upper module, a second lower die lower module, a second lower die rear locking screw, a second lower die upper die rod and a second lower die rod, the second lower die upper module and the second lower die lower module are sequentially arranged in the second lower die shell and are fixed through the second lower die rear locking screw, and the second lower die upper die rod and the second lower die rod are sequentially arranged in the second lower die upper module and the second lower die lower module; the second upper die stamping rod and the second lower die upper die rod are eccentrically arranged and are concentrically arranged with the second lower die rod; a second upper die core is embedded in the second upper die shell, a through second forming hole is formed in the second upper die core and comprises a second forming hole A section, a second forming hole B section and a second forming hole C section which are sequentially arranged, the second forming hole A section and the second forming hole C section are eccentrically arranged towards one side and are connected through the second forming hole B section; a second guide hole is formed in the center of the second upper die shell, and the second guide hole and the section A of the second forming hole are concentrically arranged; a second lower die core is embedded in the second lower die upper die block, a third through forming hole is formed in the second lower die core, and the section A of the second forming hole of the third forming hole and the section A of the second forming hole are eccentrically arranged; a third through guide hole is formed in the upper module of the second lower die, and the third guide hole and the third forming hole are arranged concentrically; and a fourth guide hole penetrating through the upper center of the lower module of the second lower die is formed, and the fourth guide hole and the third guide hole are eccentrically arranged. And (5) performing an expanding and eccentric process on the bar workpiece at the position of the second die structure. In the stamping process, the small shaft section of the eccentric rotating shaft is positioned in the third forming hole, and the large shaft section is eccentrically formed under the extrusion action of the second forming hole.

Furthermore, the upper die structure of the third die structure comprises a third upper die shell, a third upper die rear pad and a third upper die stamping rod, the third upper die rear pad is arranged at the upper position in the third upper die shell, the third upper die stamping rod is arranged at the lower position in the third upper die shell, and the end part of the third upper die stamping rod is connected with the third upper die rear pad; the lower die structure of the third die structure comprises a third lower die shell, a third lower die upper module, a third lower die lower module, a third lower die rear locking screw, a third lower die upper die rod and a third lower die rod, the third lower die upper module and the third lower die lower module are sequentially arranged in the third lower die shell and are fixed through the third lower die rear locking screw, and the third lower die upper die rod and the third lower die rod are sequentially arranged in the third lower die upper module and the third lower die lower module; the third upper die stamping rod and the third lower die upper die rod are eccentrically arranged and are concentrically arranged with the third lower die rod; a third upper die core is embedded in the third upper die shell, a fourth through forming hole is formed in the third upper die core and comprises a fourth forming hole A section, a fourth forming hole B section and a fourth forming hole C section which are sequentially arranged, the fourth forming hole A section, the fourth forming hole B section and the fourth forming hole C section are concentrically arranged, and the diameter of the fourth forming hole A section is smaller than that of the fourth forming hole C section; a fifth guide hole is formed in the center of the third upper die shell, the fifth guide hole and the section A of the fourth forming hole are concentrically arranged, and a first positioning threaded hole is formed in the third upper die shell and located on the side wall of the fifth guide hole; the end part of the third upper die stamping rod is provided with a first positioning head; a third lower die core is embedded in the third lower die upper die block, a through fifth forming hole is formed in the third lower die core, and a section A of the fourth forming hole of the fifth forming hole and a section A of the fourth forming hole are eccentrically arranged; a sixth through guide hole is formed in the third lower die upper module, and the sixth guide hole and the fifth forming hole are arranged concentrically; and a seventh guide hole which penetrates through the lower die block of the third lower die is formed in the center of the lower die block of the third lower die, and the seventh guide hole and the sixth guide hole are eccentrically arranged. And (3) performing an eccentric shaping process on the bar workpiece at the position of the third die structure 3. In the punching process, the positioning head 331 of the third upper die punching rod 33 punches a positioning hole at the end of the large shaft section 92 of the eccentric rotating shaft, and at this time, the eccentric positions of the large shaft section 92 and the small shaft section 91 of the eccentric rotating shaft are shaped under the extrusion action of the fourth forming hole 3111 and the fifth forming hole 3511.

Furthermore, the upper die structure of the fourth die structure comprises a fourth upper die shell, a fourth upper die rear pad and a fourth upper die stamping rod, the fourth upper die rear pad is arranged at the upper position in the fourth upper die shell, the fourth upper die stamping rod is arranged at the lower position in the fourth upper die shell, and the end part of the fourth upper die stamping rod is connected with the fourth upper die rear pad; the lower die structure of the fourth die structure comprises a fourth lower die shell, a fourth lower die upper module, a fourth lower die lower module, a fourth lower die rear lock screw, a fourth lower die upper die rod and a fourth lower die rod, the fourth lower die upper module and the fourth lower die lower module are sequentially arranged in the fourth lower die shell and are fixed through the fourth lower die rear lock screw, and the fourth lower die upper die rod and the fourth lower die rod are sequentially arranged in the fourth lower die upper module and the fourth lower die lower module; the fourth upper die stamping rod and the fourth lower die upper die rod are eccentrically arranged and are concentrically arranged with the fourth lower die rod; a fourth upper die core is embedded in the fourth upper die shell, and a sixth forming hole penetrating through the fourth upper die core is formed in the fourth upper die core; an eighth guide hole is formed in the center of the fourth upper die shell, and the eighth guide hole and the sixth forming hole are concentrically arranged; a second positioning head is arranged at the end part of the fourth upper die stamping rod; a fourth lower die core is embedded in the fourth lower die upper die block, a through seventh forming hole is formed in the fourth lower die core, and the seventh forming hole and the sixth forming hole are eccentrically arranged; a ninth guide hole is formed in the upper module of the fourth lower die in a penetrating manner, and the ninth guide hole and the seventh forming hole are arranged concentrically; and a tenth guide hole penetrating through the upper center of the lower module of the fourth lower die is formed, and the tenth guide hole and the ninth guide hole are eccentrically arranged. And (5) carrying out a positioning hole shaping process on the bar workpiece at the position of the fourth die structure. In the stamping process, the second positioning head of the fourth upper die stamping rod shapes the positioning hole at the end part of the large shaft section of the eccentric rotating shaft, and the upper die structure and the lower die structure of the fourth die structure are kept at a certain distance in the stamping process, so that the connecting section of the eccentric rotating shaft is stamped.

Further, the upper die structure of the fifth die structure comprises a fifth upper die shell, a fifth upper die module, a fifth upper die spring sleeve, a fifth upper die lower rear pad, a fifth upper die upper rear pad, a fifth upper die rear sleeve, a fifth upper die push pipe, a fifth upper die push rod, a fifth upper die reverse punching cushion block and a fifth upper die ejector pin, wherein the fifth upper die module, the fifth upper die spring sleeve, the fifth upper die lower rear pad, the fifth upper die upper rear pad and the fifth upper die rear sleeve are sequentially arranged in the fifth upper die shell from bottom to top; a second positioning threaded hole is formed in the side edge of the fifth upper die shell; a fifth upper die core is embedded in the fifth upper die module, a through eighth forming hole is formed in the center of the fifth upper die core, and an eleventh guide hole is formed in the center of the fifth upper die module; a third positioning head is arranged at the end part of the fifth upper die stamping rod; the lower die structure of the fifth die structure comprises a fifth lower die shell, a fifth lower die upper die, a fifth lower die, a fifth lower die rear locking screw, a fifth lower die upper die rod and a fifth lower die rod, the fifth lower die upper die and the fifth lower die are sequentially arranged in the fifth lower die shell and are fixed through the fifth lower die rear locking screw, and the fifth lower die upper die rod and the fifth lower die rod are sequentially arranged in the fifth lower die upper die and the fifth lower die; the fifth upper die stamping rod and the fifth lower die upper die rod are eccentrically arranged and are concentrically arranged with the fifth lower die rod; a fifth lower die upper die core is embedded in the fifth lower die shell, and a ninth molding hole which is eccentrically arranged is formed in the fifth lower die upper die core; a fifth lower die upper die core is embedded in the fifth lower die upper die block, a tenth forming hole is formed in the fifth lower die core and comprises a tenth forming hole section A and a tenth forming hole section B which are sequentially arranged, the tenth forming hole section A and the tenth forming hole section B are concentrically arranged, and the diameter of the tenth forming hole section A is larger than that of the tenth forming hole section B; and a thirteenth guide hole which is eccentrically arranged is formed in the fifth lower die upper module, and the thirteenth guide hole and the tenth forming hole are concentrically arranged. And (5) performing punch forming on the large shaft section end flat hole on the bar workpiece at the position of the fifth die structure. In the stamping process, a third positioning head of a fifth upper die stamping rod stamps a flat hole at the end part of the large shaft section of the eccentric rotating shaft, and the large shaft section, the connecting section and the small shaft section of the eccentric rotating shaft are respectively stamped in the eighth forming hole, the ninth forming hole and the tenth forming hole.

Furthermore, the upper die structure of the sixth die structure comprises a sixth upper die shell, a sixth upper die module, a sixth upper die spring sleeve, a sixth upper die lower rear pad, a sixth upper die upper rear pad, a sixth upper die rear sleeve, a sixth upper die push tube, a sixth upper die push rod, a sixth upper die reverse punching cushion block, a sixth upper die reverse punching upper cushion block and a sixth upper die ejector pin, wherein the sixth upper die module, the sixth upper die spring sleeve, the sixth upper die lower rear pad, the sixth upper die upper rear pad and the sixth upper die rear sleeve are sequentially arranged in the sixth upper die shell from bottom to top, one end of the sixth upper die push tube is arranged in the sixth upper die module, the other end of the sixth upper die push tube is connected with the sixth upper die lower rear pad through the sixth upper die reverse punching cushion block, the sixth upper die push rod is arranged in the sixth upper die push tube, the end of the sixth upper die push tube is arranged in the sixth upper die lower rear pad, the sixth upper die push tube, the sixth upper die push tubes are provided with three groups of six upper die reverse punching cushion blocks, the center of the sixth upper die lower rear pad is arranged in a circular array, one end of the sixth upper die lower rear pad is arranged in the sixth upper die rear pad, and the sixth upper die rear pad, the other end of the sixth upper die is arranged in the sixth upper die rear pad, and the sixth upper die spring sleeve, and the sixth upper die ejector pins are connected with the sixth upper die ejector pin; a third positioning threaded hole is formed in the side edge of the sixth upper die shell; a sixth upper die core is embedded in one end, provided with a conical table, of the sixth upper die module, an eleventh forming hole is formed in the center of the sixth upper die core in a penetrating mode, and a twelfth guide hole is formed in the center of the sixth upper die module; a fourth positioning head is arranged at the end part of the sixth upper die stamping rod; the lower die structure of the sixth die structure comprises a sixth lower die shell, a sixth lower die pressure ring, a sixth lower die module, a sixth lower die rear lock screw, a sixth lower die upper die core, a sixth lower die core, a sixth lower die upper die rod and a sixth lower die rod, wherein the sixth lower die pressure ring and the sixth lower die module are sequentially arranged in the sixth lower die shell and are fixed through the sixth lower die rear lock screw; a special-shaped twelfth forming hole is eccentrically formed in the upper die core of the sixth lower die; a thirteenth forming hole is eccentrically arranged in the lower die core of the sixth lower die, the thirteenth forming hole comprises a thirteenth forming hole section A and a thirteenth forming hole section B which are connected in sequence, the thirteenth forming hole A section and the thirteenth forming hole B section are concentrically arranged, and the diameter of the thirteenth forming hole A section is larger than that of the thirteenth forming hole B section. And (3) punching a round hole in a flat hole at the end part of the large shaft section and punching a limiting boss of the connecting section on the bar workpiece at the position of the sixth die structure. In the stamping process, the end part of the sixth upper die stamping rod is provided with a fourth positioning head for stamping a round hole in a flat hole formed at the end part of the large shaft section of the eccentric rotating shaft, and the connecting section is formed in a twelfth forming hole in a stamping mode.

Above-mentioned technical scheme can find out, the utility model discloses following beneficial effect has: 1) The cold forging forming mode is used, and the multi-stage stamping is carried out on the bar workpiece through the first die structure, the second die structure, the third die structure, the fourth die structure, the fifth die structure and the sixth die structure, so that the low-cost and high-quality eccentric rotating shaft is obtained, the working efficiency is greatly improved, and the product yield is improved; 2) Compared with a product obtained by welding, the product obtained by cold forging has better strength, thereby prolonging the service life of the product.

Drawings

FIG. 1 is a schematic view of the present invention;

FIG. 2 is a cross-sectional view of the first mold structure;

FIG. 3 shows a cross-sectional view of the first lower mold shell;

FIG. 4 is a cross-sectional view of the second mold structure;

FIG. 5 is a cross-sectional view of the second upper die housing;

FIG. 6 is a cross-sectional view of the second lower upper die block;

FIG. 7 is a cross-sectional view of the second lower die block;

FIG. 8 is a cross-sectional view of the third die structure;

FIG. 9 is a cross-sectional view of the third upper die housing;

FIG. 10 is a cross-sectional view of the third lower upper die block;

FIG. 11 is a cross-sectional view of the third lower mold half;

FIG. 12 is a cross-sectional view of the fourth mold structure;

FIG. 13 is a cross-sectional view of the fourth upper die housing;

FIG. 14 is a cross-sectional view of the fourth lower upper die block;

FIG. 15 is a cross-sectional view of the fourth lower die block;

FIG. 16 is a cross-sectional view of the fifth mold structure;

FIG. 17 is a cross-sectional view of the fifth upper die block;

fig. 18 is a sectional view of the fifth lower die case;

FIG. 19 is a cross-sectional view of the fifth lower upper die block;

FIG. 20 is a cross-sectional view of the sixth mold structure;

FIG. 21 is a cross-sectional view of the sixth upper die block;

FIG. 22 is a top view of the upper core of the sixth lower die;

fig. 23 is a sectional view of the lower core of the sixth lower mold;

FIG. 24 is a schematic view of the sequential formation of eccentric shafts;

FIG. 25 is a front view of the eccentric rotary shaft;

fig. 26 is a sectional view taken along line a in fig. 25.

In the figure: a first mold structure 1, a first upper mold shell 11, a first upper mold back pad 12, a first upper mold punching rod 13, a first lower mold shell 14, a first molding hole 1411, a first molding hole a section 14111, a first molding hole B section 14112, a first molding hole C section 14113, a first guide hole 142, a first lower mold rod 15, a second mold structure 2, a second upper mold shell 21, a second upper mold core 211, a second molding hole 2111, a second molding hole a section 21111, a second molding hole B section 21112, a second molding hole C section 21113, a second guide hole 212, a second upper mold back pad 22, a second upper mold punching rod 23, a second lower mold shell 24, a second lower mold upper module 25, a second lower mold core 251, a third molding hole 2511, a third guide hole 252, a second lower mold lower module 26, a fourth guide hole 261, a second lower mold back locking screw 27, a second lower mold upper mold rod 28, a second lower mold core 251, a third molding hole 2511, a third guide hole 252, a second lower mold structure lower mold rod 3, a second lower mold structure a third upper die housing 31, a third upper die core 311, a fourth molding hole 3111, a fourth molding hole a section 31111, a fourth molding hole B section 31112, a fourth molding hole C section 31113, a fifth guide hole 312, a first positioning screw hole 313, a third upper die rear pad 32, a third upper die stamping bar 33, a first positioning head 331, a third lower die housing 34, a third lower die upper die block 35, a third lower die core 351, a fifth molding hole 3511, a sixth guide hole 352, a third lower die block 36, a seventh guide hole 361, a third lower die rear lock screw 37, a third lower die upper die bar 38, a third lower die bar 39, a fourth die structure 4, a fourth upper die housing 41, a fourth upper die core 411, a sixth molding hole 4111, an eighth guide hole 412, a fourth upper die rear pad 42, a fourth upper die stamping bar 43, a second upper die positioning head 431, a fourth lower die housing 44, a fourth upper die core 45, a fourth lower die core 451, a fourth lower die core module 451, a fourth upper die positioning hole B, A seventh forming hole 4511, a ninth guide hole 452, a fourth lower die block 46, a tenth guide hole 461, a fourth lower die rear locking screw 47, a fourth lower die upper die rod 48, a fourth lower die rod 49, a fifth die structure 5, a fifth upper die shell 51, a fifth upper die block 52, a fifth upper die core 521, an eighth forming hole 5211, an eleventh guide hole 522, a fifth upper die spring housing 53, a fifth upper die lower rear pad 54, a fifth upper die upper rear pad 55, a fifth upper die rear housing 56, a fifth upper die push tube 57, a fifth upper die punch rod 58, a third positioning head 581, a fifth upper die reverse lower pad 59, a fifth upper die reverse pad 510, a fifth upper die ejector 511, a second positioning screw hole 512, a fifth lower die shell 61, a fifth lower die upper die core 611, a ninth forming hole 6111, a fifth lower die upper die block 62, a fifth lower die core 621, a tenth forming hole 6211, a fifth lower die upper die lower die core a tenth molding hole section a 62111 and a tenth molding hole section B62112, a thirteenth guide hole 622, a fifth lower mold lower die block 63, a fifth lower mold back-locking screw 64, a fifth lower mold upper die bar 65, a fifth lower mold lower die bar 66, a sixth mold structure 7, a sixth upper die housing 71, a sixth upper die block 72, a sixth upper die core 721, an eleventh molding hole 7211, a twelfth guide hole 722, a sixth upper die spring housing 73, a sixth upper die lower back pad 74, a sixth upper die upper back pad 75, a sixth upper die back pad 76, a sixth upper die push tube 77, a sixth upper die push bar 78, a fourth positioning head 781, a sixth upper die reverse lower die core pad 79, a sixth upper die reverse upper pad 710, a sixth upper die thimble 711, a third positioning screw hole 712, a sixth lower die housing 81, a sixth lower die pressure ring 82, a sixth lower die block 83, a sixth lower mold back-locking screw 84, a sixth lower die upper 85, a twelfth lower die hole 86, a sixth lower die molding hole 86, a sixth lower die block 86, a sixth upper die rear locking screw 84, a sixth upper die rear die block 71, a sixth upper die rear die and a sixth upper die, A thirteenth molding hole 861, a thirteenth molding hole A section 8611, a thirteenth molding hole B section 8612, a sixth lower die upper die rod 87, a sixth lower die rod 88, a small shaft section 91, a large shaft section 92, a flat hole 921, a round hole 922, a connecting section 93 and a limiting boss 931.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Example one

Fig. 1 is a schematic diagram of a cold heading tool for producing an eccentric rotating shaft, which includes a first die structure 1, a second die structure 2, a third die structure 3, a fourth die structure 4, a fifth die structure 5 and a sixth die structure 7; the bar workpiece is subjected to eccentric punch forming step by step through the first die structure 1, the second die structure 2, the third die structure 3 and the fourth die structure 4, and is subjected to punching forming through the fifth die structure 5 and the sixth die structure 7;

the first die structure 1, the second die structure 2, the third die structure 3, the fourth die structure 4, the fifth die structure 5 and the sixth die structure 7 all comprise an upper die structure and a lower die structure which are arranged in the vertical direction.

Fig. 2 is a cross-sectional view of the first die structure 1, the upper die structure includes a first upper die shell 11, a first upper die back pad 12, and a first upper die stamping rod 13, the first upper die back pad 12 is disposed at an upper position in the first upper die shell 11, the first upper die stamping rod 13 is disposed at a lower position in the first upper die shell 11, and an end portion of the first upper die stamping rod is connected to the first upper die back pad 12; the lower die structure of the first die structure 1 comprises a first lower die shell 14 and a first lower die rod 15, and one end of the first lower die rod 15 is arranged in the first lower die shell 14; the first upper die stamping rod 13 and the first lower die stamping rod 15 are eccentrically arranged; as shown in fig. 3, a cross-sectional view of the first lower mold shell 14 is provided, a first lower mold core 141 is embedded in the first lower mold core 141, a first forming hole 1411 penetrating the first lower mold core 141 is provided in the first lower mold core 141, the first lower mold core includes a first forming hole a section 14111, a first forming hole B section 14112, and a first forming hole C section 14113, the first forming hole a section 14111 and the first forming hole B section 14112 are arranged in an eccentric manner, a connecting portion of the first forming hole a section 14111 and the first forming hole B section 14112 is provided with an excessive fillet, and the first forming hole B section 14112 and the first forming hole C section 14113 are arranged in a concentric manner; a first through eccentrically disposed guide hole 142 is disposed in the first lower mold shell 14, and the first guide hole 142 is concentric with the first molding hole B section 14112 of the first lower mold core 141. The bar workpiece is subjected to intense beam eccentric stamping at the position of a first forming hole 1411 of a first die structure 2, and a small shaft section 91 of an eccentric rotating shaft is subjected to primary forming under extrusion at the position of a first forming hole B section 14112 of the first forming hole 1411. In this embodiment, the diameter of the bar stock is slightly smaller than the diameter of the first hole 14111, so that the bar stock can be conveniently placed into the first lower die core 141 for stamping.

Fig. 4 is a cross-sectional view of the second die structure 2, the upper die structure includes a second upper die housing 21, a second upper die rear pad 22, and a second upper die stamping rod 23, the second upper die rear pad 22 is disposed at an upper position in the second upper die housing 21, the second upper die stamping rod 23 is disposed at a lower position in the second upper die housing 21, and an end portion of the second upper die stamping rod is connected to the second upper die rear pad 22; the lower die structure of the second die structure 2 comprises a second lower die shell 24, a second lower die upper die block 25, a second lower die block 26, a second lower die rear locking screw 27, a second lower die upper die bar 28 and a second lower die bar 29, wherein the second lower die upper die block 25 and the second lower die block 26 are sequentially arranged inside the second lower die shell 24 and are fixed through the second lower die rear locking screw 27, and the second lower die upper die bar 28 and the second lower die bar 29 are sequentially arranged inside the second lower die upper die block 25 and the second lower die block 26; the second upper die stamping rod 23 and the second lower die upper die rod 28 are eccentrically arranged and are concentrically arranged with the second lower die rod 29; as shown in fig. 5, a cross-sectional view of the second upper mold housing 21 is provided, a second upper mold core 211 is embedded in the second upper mold core 211, a second forming hole 2111 penetrating the second upper mold core 211 is provided, the second upper mold core includes a second forming hole a section 21111, a second forming hole B section 21112 and a second forming hole C section 21113 which are sequentially arranged, the second forming hole a section 21111 and the second forming hole C section 21113 are eccentrically arranged to one side and are connected through the second forming hole B section 21112; a second guide hole 212 is formed in the center of the second upper die shell 21, and the second guide hole 212 and the second forming hole a section 21111 are concentrically arranged; fig. 6 is a cross-sectional view of the second lower upper mold block 25, in which a second lower mold core 251 is embedded, a third forming hole 2511 penetrating through the second lower mold core 251 is provided in the second lower mold core 251, and the third forming hole 2511 and a second forming hole a section 21111 of the second forming hole 2111 are eccentrically disposed; a third guide hole 252 is formed in the second lower die upper die block 25 in a penetrating manner, and the third guide hole 252 and a third forming hole 2511 are arranged concentrically; fig. 7 is a cross-sectional view of the second lower mold lower die block 26, and a fourth guide hole 261 is formed through the upper center of the second lower die block, and the fourth guide hole 261 and the third guide hole 252 are eccentrically arranged. The bar workpiece is subjected to an expanding eccentric process at the position of the second die structure 2. In the stamping process, the small shaft section 91 of the eccentric rotating shaft is located in the third forming hole 2511, and the large shaft section 92 is eccentrically formed under the extrusion action of the second forming hole 2111. In this embodiment, the third molding hole 2511 has a diameter slightly larger than the diameter of the first molding hole B section 14112 of the first molding hole 1411.

Fig. 8 is a cross-sectional view of the third die structure 3, the upper die structure includes a third upper die housing 31, a third upper die rear pad 32, and a third upper die ram 33, the third upper die rear pad 32 is disposed at an upper position in the third upper die housing 31, the third upper die ram 33 is disposed at a lower position in the third upper die housing 31, and an end portion of the third upper die rear pad is connected to the third upper die rear pad 32; the lower die structure of the third die structure 3 includes a third lower die housing 34, a third lower die upper die 35, a third lower die 36, a third lower die rear lock screw 37, a third lower die upper die rod 38, and a third lower die rod 39, the third lower die upper die 35 and the third lower die 36 are sequentially disposed inside the third lower die housing 34 and fixed by the third lower die rear lock screw 37, and the third lower die upper die rod 38 and the third lower die rod 39 are sequentially disposed inside the third lower die upper die 35 and the third lower die 36; the third upper die stamping rod 33 and the third lower die upper die rod 38 are eccentrically arranged and are concentrically arranged with the third lower die rod 39; fig. 9 is a cross-sectional view of the third upper mold shell 31, a third upper mold core 311 is embedded in the third upper mold core 311, a through fourth molding hole 3111 is arranged in the third upper mold core 311, the fourth molding hole 31111, the fourth molding hole B31112 and the fourth molding hole C31113 are arranged in sequence, the fourth molding hole a 31111, the fourth molding hole B31112 and the fourth molding hole C31113 are arranged concentrically, and a diameter of the fourth molding hole a 31111 is smaller than a diameter of the fourth molding hole C31113; a fifth guide hole 312 is formed in the center of the third upper die shell 31, the fifth guide hole 312 and the section a 31111 of the fourth forming hole are concentrically arranged, and a first positioning threaded hole 313 is formed in the side wall of the fifth guide hole 312 on the third upper die shell 31; a first positioning head 331 is arranged at the end part of the third upper die stamping rod 33; fig. 10 is a cross-sectional view of the third lower upper mold block 35, in which a third lower mold core 351 is embedded, a through fifth forming hole 3511 is provided in the third lower mold core 351, and the fifth forming hole 3511 and a fourth forming hole a section 31111 of the fourth forming hole 3111 are eccentrically disposed; a sixth through guide hole 352 is formed in the third lower mold upper die block 35, and the sixth through guide hole 352 and the fifth forming hole 3511 are concentrically arranged; fig. 11 is a cross-sectional view of the third lower mold lower die block 36, wherein a seventh guide hole 361 is formed at a central position of the third lower die block, and the seventh guide hole 361 and the sixth guide hole 352 are eccentrically arranged. And (3) performing an eccentric shaping process on the bar workpiece at the position of the third die structure 3. In the punching process, the positioning head 331 of the third upper die punching bar 33 punches a positioning hole at the end of the large shaft segment 92 of the eccentric rotating shaft, and at this time, the eccentric positions of the large shaft segment 92 and the small shaft segment 91 of the eccentric rotating shaft are shaped under the squeezing action of the fourth forming hole 3111 and the fifth forming hole 3511. In this embodiment, the diameter of the fourth forming hole 3111 is slightly larger than the diameter of the second forming hole 2111, the section a 21111 of the second forming hole 2111, and the diameter of the fifth forming hole 3511 is slightly larger than the diameter of the third forming hole 2511.

Fig. 12 is a cross-sectional view of the fourth die structure 4, the upper die structure thereof includes a fourth upper die housing 41, a fourth upper die rear pad 42, and a fourth upper die ram 43, the fourth upper die rear pad 42 is disposed at an upper position in the fourth upper die housing 41, the fourth upper die ram 43 is disposed at a lower position in the fourth upper die housing 41, and an end portion thereof is connected to the fourth upper die rear pad 42; the lower die structure of the fourth die structure 4 comprises a fourth lower die shell 44, a fourth lower die upper die 45, a fourth lower die 46, a fourth lower die rear lock screw 47, a fourth lower die upper die rod 48 and a fourth lower die rod 49, the fourth lower die upper die 45 and the fourth lower die 46 are sequentially arranged inside the fourth lower die shell 44 and fixed through the fourth lower die rear lock screw 47, and the fourth lower die upper die rod 48 and the fourth lower die rod 49 are sequentially arranged inside the fourth lower die upper die 45 and the fourth lower die 46; the fourth upper die stamping rod 43 and the fourth lower die upper die rod 48 are eccentrically arranged and are concentrically arranged with the fourth lower die rod 49; fig. 13 is a cross-sectional view of the fourth upper mold shell 41, a fourth upper mold core 411 is embedded inside the fourth upper mold core 411, and a sixth forming hole 4111 penetrating through the fourth upper mold core 411 is formed inside the fourth upper mold core 411; an eighth guide hole 412 is formed in the center of the fourth upper die casing 41, and the eighth guide hole 412 and the sixth forming hole 4111 are concentrically arranged; a second positioning head 431 is arranged at the end part of the fourth upper die stamping rod 43; a fourth lower die core 451 is embedded in the fourth lower die upper die block 45, a through seventh forming hole 4511 is formed in the fourth lower die core 451, and the seventh forming hole 4511 and the sixth forming hole 4111 are eccentrically arranged; fig. 14 is a cross-sectional view of the fourth lower mold upper mold block 45, wherein a ninth guide hole 452 is formed therethrough, and the ninth guide hole 452 is concentric with a seventh forming hole 4511; as shown in fig. 15, a cross-sectional view of the fourth lower mold lower die block 46 is provided, and a tenth guide hole 461 is formed at a central position thereof, and the tenth guide hole 461 is eccentrically arranged with respect to the ninth guide hole 452. And (4) carrying out a positioning hole shaping process on the bar workpiece at the position of the fourth die structure 4. In the stamping process, the second positioning head 431 of the fourth upper die stamping rod 43 shapes the positioning hole at the end of the large shaft section 92 of the eccentric rotating shaft, and the upper die structure and the lower die structure of the fourth die structure 4 ensure a certain distance in the stamping process, so that the connecting section 93 of the eccentric rotating shaft is stamped. In this embodiment, the diameter of the sixth forming hole 4111 is slightly larger than that of the fourth forming hole 3111, and the diameter of the seventh forming hole 4511 is slightly larger than that of the fifth forming hole 3511.

As shown in fig. 16, which is a cross-sectional view of the fifth mold structure 5, the upper mold structure includes a fifth upper mold housing 51, a fifth upper mold module 52, a fifth upper mold spring housing 53, a fifth upper mold lower rear pad 54, a fifth upper mold upper rear pad 55, a fifth upper mold rear housing 56, a fifth upper mold push tube 57, a fifth upper mold punch bar 58, a fifth upper mold reverse-striking lower pad 59, a fifth upper mold reverse-striking upper pad 510, and a fifth upper mold push pin 511, wherein the fifth upper mold module 52, the fifth upper mold spring housing 53, the fifth upper mold lower rear pad 54, the fifth upper mold upper rear pad 55, and the fifth upper mold rear housing 56 are sequentially disposed inside the fifth upper mold housing 51 from bottom to top, one end of the fifth upper die push pipe 57 is arranged in the fifth upper die module 52, the other end of the fifth upper die push pipe is connected with a fifth upper die lower rear pad 54 through a fifth upper die reverse striking lower pad 59, the fifth upper die push rod 58 is arranged in the fifth upper die push pipe 57, the end part of the fifth upper die push pipe is arranged in the fifth upper die lower rear pad 54, the fifth upper die ejector pins 511 are divided into three groups, the fifth upper die ejector pins are arranged in a circumferential array by taking the center of the fifth upper die lower rear pad 54 as the center, one end of the fifth upper die push pipe is arranged in the fifth upper die lower rear pad 54, and the other end of the fifth upper die push pipe is connected with a fifth upper die reverse striking upper pad 510 arranged in the fifth upper die spring sleeve 53; a second positioning threaded hole 512 is formed in the side edge of the fifth upper die shell 51; fig. 17 is a cross-sectional view of the fifth upper die block 52, in which a fifth upper die core 521 is embedded, the center of the fifth upper die core 521 is provided with an eighth forming hole 5211, and the center of the fifth upper die block 52 is further provided with an eleventh guiding hole 522; a third positioning head 581 is arranged at the end part of the fifth upper die stamping rod 58; the lower die structure of the fifth die structure 5 includes a fifth lower die housing 61, a fifth lower die upper die block 62, a fifth lower die block 63, a fifth lower die rear lock screw 64, a fifth lower die upper die rod 65, and a fifth lower die rod 66, the fifth lower die upper die block 62 and the fifth lower die block 63 are sequentially disposed inside the fifth lower die housing 61 and fixed by the fifth lower die rear lock screw 64, and the fifth lower die upper die rod 65 and the fifth lower die rod 66 are sequentially disposed inside the fifth lower die upper die block 62 and the fifth lower die block 63; the fifth upper die stamping rod 58 and the fifth lower die upper die rod 65 are eccentrically arranged and are concentrically arranged with the fifth lower die rod 66; fig. 18 is a cross-sectional view of the fifth lower die shell 61, a fifth lower die upper die core 611 is embedded in the fifth lower die shell, and a ninth molding hole 6111 which is eccentrically arranged is formed in the fifth lower die upper die core 611; fig. 19 is a cross-sectional view of the fifth lower mold upper mold block 62, a fifth lower mold core 621 is embedded in the fifth lower mold upper mold block, a tenth forming hole 6211 is formed in the fifth lower mold core 621, and includes a tenth forming hole a section 62111 and a tenth forming hole B section 62112 which are sequentially arranged, the tenth forming hole a section 62111 and the tenth forming hole B section 62112 are concentrically arranged, and the diameter of the tenth forming hole a section 62111 is larger than that of the tenth forming hole B section 62112; the fifth lower die upper die block 62 is provided with a thirteenth guide hole 622 which is eccentrically arranged, and the thirteenth guide hole 622 and the tenth forming hole 6211 are concentrically arranged. And (3) performing a punch forming process on the flat hole 921 at the end part of the large shaft section 92 on the bar workpiece at the position of the fifth die structure 5. In the punching process, the third positioning head 581 of the fifth upper die punching rod 58 punches the flat hole 921 at the end of the large shaft section 92 of the eccentric rotating shaft, and the large shaft section 92, the connecting section 93 and the small shaft section 91 of the eccentric rotating shaft are respectively punched and formed in the eighth forming hole 5211, the ninth forming hole 6111 and the tenth forming hole 6211. In this embodiment, the diameter of the eighth forming hole 5211 is slightly larger than the diameter of the sixth forming hole 4111, and the diameter of the tenth forming hole 6211 is slightly larger than the diameter of the seventh forming hole 4511.

As shown in fig. 20, which is a cross-sectional view of the sixth mold structure 7, an upper mold structure thereof includes a sixth upper mold housing 71, a sixth upper mold module 72, a sixth upper mold spring housing 73, a sixth upper mold lower rear pad 74, a sixth upper mold upper rear pad 75, a sixth upper mold rear housing 76, a sixth upper mold push pipe 77, a sixth upper mold punch bar 78, a sixth upper mold reverse-striking lower pad 79, a sixth upper mold reverse-striking upper pad 710, and a sixth upper mold ejector pin 711, wherein the sixth upper mold module 72, the sixth upper mold spring housing 73, the sixth upper mold lower rear pad 74, the sixth upper mold upper rear pad 75, and the sixth upper mold rear housing 76 are sequentially disposed inside the sixth upper mold housing 71 from bottom to top, one end of the sixth upper die push pipe 77 is arranged in the sixth upper die module 72, the other end of the sixth upper die push pipe is connected with the sixth upper die lower rear pad 74 through a sixth upper die reverse lower pad 79, the sixth upper die punch rod 78 is arranged in the sixth upper die push pipe 77, the end part of the sixth upper die push pipe is arranged in the sixth upper die lower rear pad 74, the sixth upper die ejector pins 711 are divided into three groups, the sixth upper die ejector pins are arranged in a circumferential array by taking the center of the sixth upper die lower rear pad 74 as the center, one end of the sixth upper die push pipe is arranged in the sixth upper die lower rear pad 74, and the other end of the sixth upper die push pipe is connected with a sixth upper die reverse upper pad 710 arranged in the sixth upper die spring sleeve 73; a third positioning threaded hole 712 is formed in the side edge of the sixth upper die shell 71; fig. 21 is a cross-sectional view of the sixth upper die module 72, wherein a sixth upper die core 721 is embedded in one end of the sixth upper die module 72, a through eleventh forming hole 7211 is formed in the center of the sixth upper die core 721, and a twelfth guide hole 722 is further formed in the center of the sixth upper die module 72; a fourth positioning head 781 is arranged at the end part of the sixth upper die stamping rod 78; the lower die structure of the sixth die structure 7 includes a sixth lower die housing 81, a sixth lower die pressure ring 82, a sixth lower die module 83, a sixth lower die rear lock screw 84, a sixth lower die upper die core 85, a sixth lower die core 86, a sixth lower die upper die rod 87, and a sixth lower die rod 88, the sixth lower die pressure ring 82 and the sixth lower die module 83 are sequentially disposed in the sixth lower die housing 81, and are fixed by the sixth lower die rear lock screw 84, the sixth lower die upper die core 85 and the sixth lower die core 86 are sequentially disposed in the sixth lower die pressure ring 82, one end of the sixth lower die upper die rod 87 is disposed in the sixth lower die core 86, and the other end is connected to an end of the sixth lower die rod 88 disposed in the sixth lower die module 83; fig. 22 is a top view of the sixth lower mold upper core 85, wherein a shaped twelfth molding hole 851 is eccentrically disposed therein; fig. 23 shows a cross-sectional view of the sixth lower mold insert 86, wherein a thirteenth molding hole 861 is eccentrically arranged in the sixth lower mold insert, the thirteenth molding hole 861 comprises a thirteenth molding hole a section 8611 and a thirteenth molding hole B section 8612 which are sequentially connected, the thirteenth molding hole a section 8611 and the thirteenth molding hole B section 8612 are concentrically arranged, and the diameter of the thirteenth molding hole a section 8611 is larger than the diameter of the thirteenth molding hole B section 8612. And (3) punching a round hole 922 in a flat hole 921 at the end part of the large shaft section 92 and punching a limit boss of the connecting section 93 on the bar workpiece at the position of the sixth die structure 7. In the stamping process, the end of the sixth upper die stamping rod 78 is provided with a fourth positioning head 781 for stamping a round hole 922 in a flat hole 921 formed at the end of the large shaft section 92 of the eccentric rotating shaft, and the connecting section 93 is formed in a twelfth forming hole 851 in a stamping mode. In this embodiment, the diameter of the eleventh molding hole 7211 is slightly larger than the diameter of the eighth molding hole 5211, the diameter of the thirteenth molding hole 861 is slightly larger than the diameter of the tenth molding hole 6211, and the cross-sectional dimension of the twelfth molding hole 851 is determined according to the dimension of the limiting boss 931 of the connecting section 93 to be stamped actually.

All the die cores are made of tungsten steel, so that the abrasion of the die cores during cold heading is reduced, the service life of the cold heading tool part is prolonged, and the size precision of an eccentric rotating shaft workpiece subjected to cold heading is improved.

As shown in fig. 24, the eccentric rotating shaft is sequentially formed, the formed eccentric rotating shaft is deburred through a machining center, and the finished eccentric rotating shaft part shown in fig. 25 is obtained, and includes a small shaft section 91, a connecting section 93 and a large shaft section 92 which are sequentially connected, the small shaft section 91 and the large shaft section 92 are eccentrically arranged, as shown in fig. 26, an a-direction cross-sectional view in fig. 25 is provided, a flat hole 921 and a round hole 922 which are sequentially connected are provided in the large shaft section 92, and a limit boss 931 is further provided on the connecting section 93.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications can be made without departing from the principles of the present invention, and these modifications should also be regarded as the protection scope of the present invention.

Claims (7)

1. The utility model provides a production of eccentric pivot of on-vehicle refrigerator door is with cold-heading frock which characterized in that: the eccentric rotating shaft forming die comprises a first die structure (1), a second die structure (2), a third die structure (3), a fourth die structure (4), a fifth die structure (5) and a sixth die structure (7) which are used for forming an eccentric rotating shaft in sequence; the bar workpiece is subjected to eccentric punch forming step by step through the first die structure (1), the second die structure (2), the third die structure (3) and the fourth die structure (4), and is subjected to punching forming through the fifth die structure (5) and the sixth die structure (7);

the first die structure (1), the second die structure (2), the third die structure (3), the fourth die structure (4), the fifth die structure (5) and the sixth die structure (7) respectively comprise an upper die structure and a lower die structure which are arranged in the vertical direction.

2. The cold heading frock is used in production of on-vehicle refrigerator door eccentric rotating shaft of claim 1, characterized in that: the upper die structure of the first die structure (1) comprises a first upper die shell (11), a first upper die rear pad (12) and a first upper die stamping rod (13), wherein the first upper die rear pad (12) is arranged at the upper position in the first upper die shell (11), the first upper die stamping rod (13) is arranged at the lower position in the first upper die shell (11), and the end part of the first upper die stamping rod is connected with the first upper die rear pad (12); the lower die structure of the first die structure (1) comprises a first lower die shell (14) and a first lower die rod (15), and one end of the first lower die rod (15) is arranged in the first lower die shell (14); the first upper die stamping rod (13) and the first lower die stamping rod (15) are arranged eccentrically; a first lower die core (141) is embedded in the first lower die mould shell (14), a first through forming hole (1411) is formed in the first lower die core (141), and comprises a first forming hole A section (14111), a first forming hole B section (14112) and a first forming hole C section (14113) which are sequentially arranged, the first forming hole A section (14111) and the first forming hole B section (14112) are eccentrically arranged, the joint of the first forming hole A section (14111) and the first forming hole B section (14112) is provided with an excessive fillet, and the first forming hole B section (14112) and the first forming hole C section (14113) are concentrically arranged; the first lower die mould shell (14) is internally provided with a first guide hole (142) which penetrates through the first lower die mould shell and is eccentrically arranged, and the first guide hole (142) is concentric with a first forming hole B section (14112) of the first lower die mould core (141).

3. The cold heading frock is used in production of on-vehicle refrigerator door eccentric rotating shaft of claim 1, characterized in that: the upper die structure of the second die structure (2) comprises a second upper die shell (21), a second upper die rear pad (22) and a second upper die stamping rod (23), the second upper die rear pad (22) is arranged at the upper position in the second upper die shell (21), the second upper die stamping rod (23) is arranged at the lower position in the second upper die shell (21), and the end part of the second upper die stamping rod is connected with the second upper die rear pad (22); the lower die structure of the second die structure (2) comprises a second lower die shell (24), a second lower die upper module (25), a second lower die lower module (26), a second lower die rear lock screw (27), a second lower die upper die rod (28) and a second lower die rod (29), wherein the second lower die upper module (25) and the second lower die lower module (26) are sequentially arranged in the second lower die shell (24) and are fixed through the second lower die rear lock screw (27), and the second lower die upper die rod (28) and the second lower die rod (29) are sequentially arranged in the second lower die upper module (25) and the second lower die lower module (26); the second upper die stamping rod (23) and the second lower die upper die rod (28) are eccentrically arranged and are concentrically arranged with the second lower die rod (29); a second upper die core (211) is embedded in the second upper die shell (21), a through second forming hole (2111) is formed in the second upper die core (211), the second upper die core comprises a second forming hole A section (21111), a second forming hole B section (21112) and a second forming hole C section (21113) which are sequentially arranged, the second forming hole A section (21111) and the second forming hole C section (21113) are eccentrically arranged towards one side and are connected through the second forming hole B section (21112); a second guide hole (212) is formed in the center of the second upper die shell (21), and the second guide hole (212) and the section A (21111) of the second forming hole are concentrically arranged; a second lower die core (251) is embedded in the second lower die upper die block (25), a third through forming hole (2511) is formed in the second lower die core (251), and the third forming hole (2511) and a section A (21111) of a second forming hole (2111) are eccentrically arranged; a third guide hole (252) penetrating through the upper module (25) of the second lower die is formed in the upper module (25), and the third guide hole (252) and a third forming hole (2511) are concentrically arranged; and a penetrating fourth guide hole (261) is formed in the center of the second lower die lower module (26), and the fourth guide hole (261) and the third guide hole (252) are eccentrically arranged.

4. The cold heading frock is used in production of on-vehicle refrigerator door eccentric rotating shaft of claim 1, characterized in that: the upper die structure of the third die structure (3) comprises a third upper die shell (31), a third upper die rear pad (32) and a third upper die stamping rod (33), the third upper die rear pad (32) is arranged at the upper position in the third upper die shell (31), the third upper die stamping rod (33) is arranged at the lower position in the third upper die shell (31), and the end part of the third upper die stamping rod is connected with the third upper die rear pad (32); the lower die structure of the third die structure (3) comprises a third lower die shell (34), a third lower die upper module (35), a third lower die lower module (36), a third lower die rear lock screw (37), a third lower die upper die rod (38) and a third lower die rod (39), wherein the third lower die upper module (35) and the third lower die lower module (36) are sequentially arranged in the third lower die shell (34) and are fixed through the third lower die rear lock screw (37), and the third lower die upper die rod (38) and the third lower die rod (39) are sequentially arranged in the third lower die upper module (35) and the third lower die lower module (36); the third upper die stamping rod (33) and the third lower die upper die rod (38) are eccentrically arranged and are concentrically arranged with the third lower die rod (39); a third upper die core (311) is embedded in the third upper die shell (31), a penetrating fourth forming hole (3111) is formed in the third upper die core (311), and comprises a fourth forming hole a section (31111), a fourth forming hole B section (31112) and a fourth forming hole C section (31113) which are sequentially arranged, the fourth forming hole a section (31111), the fourth forming hole B section (31112) and the fourth forming hole C section (31113) are concentrically arranged, and the diameter of the fourth forming hole a section (31111) is smaller than that of the fourth forming hole C section (31113); a fifth guide hole (312) is formed in the center of the third upper die shell (31), the fifth guide hole (312) and the section A (31111) of the fourth forming hole are concentrically arranged, and a first positioning threaded hole (313) is formed in the side wall, located on the fifth guide hole (312), of the third upper die shell (31); a first positioning head (331) is arranged at the end part of the third upper die stamping rod (33); a third lower die core (351) is embedded in the third lower die upper die block (35), a through fifth forming hole (3511) is formed in the third lower die core (351), and a section A (31111) of the fourth forming hole (3111) and the fifth forming hole (3511) are eccentrically arranged; a sixth guide hole (352) penetrating through the upper module (35) of the third lower die is formed, and the sixth guide hole (352) and a fifth forming hole (3511) are concentrically arranged; and a seventh guide hole (361) which penetrates through the third lower die lower module (36) is formed in the center of the third lower die lower module, and the seventh guide hole (361) and the sixth guide hole (352) are eccentrically arranged.

5. The cold-heading frock is used in production of on-vehicle refrigerator door eccentric rotating shaft of claim 1, its characterized in that: the upper die structure of the fourth die structure (4) comprises a fourth upper die shell (41), a fourth upper die rear pad (42) and a fourth upper die stamping rod (43), the fourth upper die rear pad (42) is arranged at the upper position in the fourth upper die shell (41), the fourth upper die stamping rod (43) is arranged at the lower position in the fourth upper die shell (41), and the end part of the fourth upper die stamping rod is connected with the fourth upper die rear pad (42); the lower die structure of the fourth die structure (4) comprises a fourth lower die shell (44), a fourth lower die upper module (45), a fourth lower die lower module (46), a fourth lower die rear lock screw (47), a fourth lower die upper die rod (48) and a fourth lower die rod (49), wherein the fourth lower die upper module (45) and the fourth lower die lower module (46) are sequentially arranged in the fourth lower die shell (44) and are fixed through the fourth lower die rear lock screw (47), and the fourth lower die upper die rod (48) and the fourth lower die rod (49) are sequentially arranged in the fourth lower die upper module (45) and the fourth lower die lower module (46); the fourth upper die stamping rod (43) and the fourth lower die upper die rod (48) are eccentrically arranged and are concentrically arranged with the fourth lower die rod (49); a fourth upper die core (411) is embedded in the fourth upper die shell (41), and a sixth through forming hole (4111) is formed in the fourth upper die core (411); an eighth guide hole (412) is formed in the center of the fourth upper die shell (41), and the eighth guide hole (412) and the sixth forming hole (4111) are concentrically arranged; a second positioning head (431) is arranged at the end part of the fourth upper die stamping rod (43); a fourth lower die core (451) is embedded in the fourth lower die upper module (45), a seventh through molding hole (4511) is formed in the fourth lower die core (451), and the seventh through molding hole (4511) and the sixth through molding hole (4111) are eccentrically arranged; a ninth guide hole (452) is formed in the fourth lower die upper module (45) in a penetrating mode, and the ninth guide hole (452) and the seventh forming hole (4511) are arranged in a concentric mode; a tenth guide hole (461) penetrates through the upper center of the fourth lower die lower module (46), and the tenth guide hole (461) and the ninth guide hole (452) are eccentrically arranged.

6. The cold heading frock is used in production of on-vehicle refrigerator door eccentric rotating shaft of claim 1, characterized in that: the upper die structure of the fifth die structure (5) comprises a fifth upper die shell (51), a fifth upper die module (52), a fifth upper die spring sleeve (53), a fifth upper die lower rear pad (54), a fifth upper die upper rear pad (55), a fifth upper die rear sleeve (56), a fifth upper die push pipe (57), a fifth upper die stamping rod (58), a fifth upper die reverse-striking lower cushion block (59), a fifth upper die reverse-striking upper cushion block (510) and a fifth upper die ejector pin (511), the fifth upper die module (52), the fifth upper die spring sleeve (53), the fifth upper die lower rear pad (54), the fifth upper die upper rear pad (55) and the fifth upper die rear sleeve (56) are sequentially arranged in the fifth upper die shell (51) from bottom to top, one end of the fifth upper die push pipe (57) is arranged in the fifth upper die module (52), the other end is connected with a fifth upper die lower back cushion (54) through a fifth upper die reverse lower cushion block (59), the fifth upper die stamping rods (58) are arranged in the fifth upper die push pipe (57), the end parts of the fifth upper die stamping rods are arranged in the fifth upper die lower rear pad (54), the fifth upper die push pins (511) have three groups, the centers of the fifth upper die lower back cushion (54) are used as centers and are arranged in a circumferential array, one end of the fifth upper die lower back cushion (54) is arranged in the fifth upper die lower back cushion, and the other end of the fifth upper die lower back cushion is connected with a fifth upper die reverse beating upper cushion block (510) arranged in a fifth upper die spring sleeve (53); a second positioning threaded hole (512) is formed in the side edge of the fifth upper die shell (51); a fifth upper die core (521) is embedded in the fifth upper die module (52), a through eighth forming hole (5211) is formed in the center of the fifth upper die core (521), and an eleventh guide hole (522) is formed in the center of the fifth upper die module (52); a third positioning head (581) is arranged at the end part of the fifth upper die stamping rod (58); the lower die structure of the fifth die structure (5) comprises a fifth lower die shell (61), a fifth lower die upper module (62), a fifth lower die lower module (63), a fifth lower die rear lock screw (64), a fifth lower die upper die rod (65) and a fifth lower die rod (66), wherein the fifth lower die upper module (62) and the fifth lower die lower module (63) are sequentially arranged in the fifth lower die shell (61) and are fixed through the fifth lower die rear lock screw (64), and the fifth lower die upper die rod (65) and the fifth lower die rod (66) are sequentially arranged in the fifth lower die upper module (62) and the fifth lower die lower module (63); the fifth upper die stamping rod (58) and the fifth lower die upper die rod (65) are eccentrically arranged and are concentrically arranged with the fifth lower die rod (66); a fifth lower die upper die core (611) is embedded in the fifth lower die shell (61), and a ninth eccentrically-arranged forming hole (6111) is formed in the fifth lower die upper die core (611); a fifth lower die core (621) is embedded in the fifth lower die upper die block (62), a tenth forming hole (6211) is formed in the fifth lower die core (621), the tenth forming hole comprises a tenth forming hole A section (62111) and a tenth forming hole B section (62112) which are sequentially arranged, the tenth forming hole A section (62111) and the tenth forming hole B section (62112) are concentrically arranged, and the diameter of the tenth forming hole A section (62111) is larger than that of the tenth forming hole B section (62112); and a thirteenth guide hole (622) which is eccentrically arranged is formed in the fifth lower die upper die block (62), and the thirteenth guide hole (622) and the tenth forming hole (6211) are concentrically arranged.

7. The cold-heading frock is used in production of on-vehicle refrigerator door eccentric rotating shaft of claim 1, its characterized in that: the upper die structure of the sixth die structure (7) comprises a sixth upper die shell (71), a sixth upper die module (72), a sixth upper die spring sleeve (73), a sixth upper die lower rear pad (74), a sixth upper die upper rear pad (75), a sixth upper die rear sleeve (76), a sixth upper die push pipe (77), a sixth upper die punching rod (78), a sixth upper die reverse punching lower cushion block (79), a sixth upper die reverse punching upper cushion block (710) and a sixth upper die ejector pin (711), the sixth upper die module (72), the sixth upper die spring sleeve (73), the sixth upper die lower rear pad (74), the sixth upper die upper rear pad (75) and the sixth upper die rear sleeve (76) are sequentially arranged in the sixth upper die shell (71) from bottom to top, one end of the sixth upper die push pipe (77) is arranged in the sixth upper die module (72), the other end is connected with the sixth upper die lower back cushion (74) through the sixth upper die reverse lower cushion block (79), the sixth upper die stamping rod (78) is arranged in a sixth upper die push pipe (77), the end part of the sixth upper die stamping rod is arranged in a sixth upper die lower back cushion (74), the sixth upper die ejector pins (711) have three groups, the center of the sixth upper die lower rear pad (74) is used as the center to be arranged in a circumferential array, one end of the sixth upper die lower rear pad is arranged in the sixth upper die lower rear pad (74), and the other end of the sixth upper die lower rear pad is connected with a sixth upper die reverse hitting upper cushion block (710) arranged in a sixth upper die spring sleeve (73); a third positioning threaded hole (712) is formed in the side edge of the sixth upper die shell (71); a sixth upper die core (721) is embedded in one end, provided with a conical table, of the sixth upper die module (72), an eleventh forming hole (7211) penetrating through the sixth upper die core (721) is formed in the center of the sixth upper die core, and a twelfth guide hole (722) is formed in the center of the sixth upper die module (72); a fourth positioning head (781) is arranged at the end part of the sixth upper die stamping rod (78); the lower die structure of the sixth die structure (7) comprises a sixth lower die shell (81), a sixth lower die pressure ring (82), a sixth lower die module (83), a sixth lower die rear lock screw (84), a sixth lower die upper die core (85), a sixth lower die core (86), a sixth lower die upper die rod (87) and a sixth lower die rod (88), wherein the sixth lower die pressure ring (82) and the sixth lower die module (83) are sequentially arranged in the sixth lower die shell (81) and are fixed through the sixth lower die rear lock screw (84), the sixth lower die upper die core (85) and the sixth lower die core (86) are sequentially arranged in the sixth lower die pressure ring (82), one end of the sixth lower die upper die rod (87) is arranged in the sixth lower die core (86), and the other end of the sixth lower die upper die rod (88) is connected with the end of the sixth lower die rod (88) arranged in the sixth lower die module (83); a special-shaped twelfth forming hole (851) is eccentrically arranged in the upper die core (85) of the sixth lower die; a thirteenth forming hole (861) is eccentrically arranged in the sixth lower die core (86), the thirteenth forming hole (861) comprises a thirteenth forming hole A section (8611) and a thirteenth forming hole B section (8612) which are sequentially connected, the thirteenth forming hole A section (8611) and the thirteenth forming hole B section (8612) are concentrically arranged, and the diameter of the thirteenth forming hole A section (8611) is larger than that of the thirteenth forming hole B section (8612).

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